
It's straight, it's in a LOOP,
The Big Bang Theory Season 11, Episode 13

What about LOOP quantum gravity?
The Big Bang Theory Season 7, Episode 20

Loop quantum gravity clearly offers more
testable predictions than string theory.
The Big Bang Theory Season 2, Episode 2

Not till you tell me about
your latest paper on quantum LOOP theory.
The Big Bang Theory Season 10, Episode 24

No, there isn't. Only LOOP quantum gravity
calculates the entropy of black holes.
The Big Bang Theory Season 2, Episode 2